"use client";

import { type ReactNode, createContext, useContext, useState } from "react";

import { faker } from "@faker-js/faker";
import { cn } from "@udecode/cn";
import { CopilotPlugin } from "@udecode/plate-ai/react";
import { useEditorPlugin } from "@udecode/plate-common/react";
import { useChat as useBaseChat } from "ai/react";
import { ArrowUpRight, Check, ChevronsUpDown, Eye, EyeOff, Settings } from "lucide-react";
import { Button } from "~/components/plate-ui/button";
import {
	Command,
	CommandEmpty,
	CommandGroup,
	CommandInput,
	CommandItem,
	CommandList,
} from "~/components/plate-ui/command";
import {
	Dialog,
	DialogContent,
	DialogDescription,
	DialogHeader,
	DialogTitle,
	DialogTrigger,
} from "~/components/plate-ui/dialog";
import { Input } from "~/components/plate-ui/input";
import { Popover, PopoverContent, PopoverTrigger } from "~/components/plate-ui/popover";

export const useChat = (props?: Parameters<typeof useBaseChat>[0]) => {
	return useBaseChat({
		id: "editor",
		api: "/api/ai/command",
		...props,
	});
};

// Used for testing. Remove it after implementing useChat api.
const fakeStreamText = ({
	chunkCount = 10,
	streamProtocol = "data",
}: {
	chunkCount?: number;
	streamProtocol?: "data" | "text";
} = {}) => {
	const chunks = Array.from({ length: chunkCount }, () => ({
		delay: faker.number.int({ max: 150, min: 50 }),
		texts: faker.lorem.words({ max: 3, min: 1 }) + " ",
	}));
	const encoder = new TextEncoder();

	return new ReadableStream({
		async start(controller) {
			for (const chunk of chunks) {
				await new Promise((resolve) => setTimeout(resolve, chunk.delay));

				if (streamProtocol === "text") {
					controller.enqueue(encoder.encode(chunk.texts));
				} else {
					controller.enqueue(encoder.encode(`0:${JSON.stringify(chunk.texts)}\n`));
				}
			}

			if (streamProtocol === "data") {
				controller.enqueue(
					`d:{"finishReason":"stop","usage":{"promptTokens":0,"completionTokens":${chunks.length}}}\n`,
				);
			}

			controller.close();
		},
	});
};

interface Model {
	label: string;
	value: string;
}

interface OpenAIContextType {
	apiKey: string;
	model: Model;
	setApiKey: (key: string) => void;
	setModel: (model: Model) => void;
}

export const models: Model[] = [
	{ label: "gpt-4o-mini", value: "gpt-4o-mini" },
	{ label: "gpt-4o", value: "gpt-4o" },
	{ label: "gpt-4-turbo", value: "gpt-4-turbo" },
	{ label: "gpt-4", value: "gpt-4" },
	{ label: "gpt-3.5-turbo", value: "gpt-3.5-turbo" },
	{ label: "gpt-3.5-turbo-instruct", value: "gpt-3.5-turbo-instruct" },
];

const OpenAIContext = createContext<OpenAIContextType | undefined>(undefined);

export function OpenAIProvider({ children }: { children: ReactNode }) {
	const [apiKey, setApiKey] = useState("");
	const [model, setModel] = useState<Model>(models[0]);

	return (
		<OpenAIContext.Provider value={{ apiKey, model, setApiKey, setModel }}>
			{children}
		</OpenAIContext.Provider>
	);
}

export function useOpenAI() {
	const context = useContext(OpenAIContext);

	return (
		context ??
		({
			apiKey: "",
			model: models[0],
			setApiKey: () => {},
			setModel: () => {},
		} as OpenAIContextType)
	);
}

export function SettingsDialog() {
	const { apiKey, model, setApiKey, setModel } = useOpenAI();
	const [tempKey, setTempKey] = useState(apiKey);
	const [showKey, setShowKey] = useState(false);
	const [open, setOpen] = useState(false);
	const [openModel, setOpenModel] = useState(false);

	const { getOptions, setOption } = useEditorPlugin(CopilotPlugin);

	const handleSubmit = (e: React.FormEvent) => {
		e.preventDefault();
		setApiKey(tempKey);
		setOpen(false);

		const completeOptions = getOptions().completeOptions ?? {};

		setOption("completeOptions", {
			...completeOptions,
			body: {
				...completeOptions.body,
				apiKey: tempKey,
				model: model.value,
			},
		});
	};

	return (
		<Dialog open={open} onOpenChange={setOpen}>
			<DialogTrigger asChild>
				<Button
					size="icon"
					variant="default"
					className={cn(
						"group fixed bottom-4 right-4 z-50 size-10 overflow-hidden",
						"rounded-full shadow-md hover:shadow-lg",
						"transition-all duration-300 ease-in-out hover:w-[106px]",
					)}
					data-block-hide
				>
					<div className="flex size-full items-center justify-start gap-2">
						<Settings className="ml-1.5 size-4" />
						<span
							className={cn(
								"whitespace-nowrap opacity-0 transition-all duration-300 ease-in-out",
								"group-hover:translate-x-0 group-hover:opacity-100",
								"-translate-x-2",
							)}
						>
							Settings
						</span>
					</div>
				</Button>
			</DialogTrigger>
			<DialogContent>
				<DialogHeader className="space-y-4">
					<DialogTitle>AI Settings</DialogTitle>
					<DialogDescription>
						Enter your{" "}
						<a
							className="inline-flex items-center font-medium text-primary hover:underline"
							href="https://platform.openai.com/api-keys"
							rel="noreferrer"
							target="_blank"
						>
							OpenAI API key
							<ArrowUpRight className="size-[14px]" />
						</a>{" "}
						to use AI features.
					</DialogDescription>
				</DialogHeader>
				<form className="space-y-4" onSubmit={handleSubmit}>
					<div className="relative">
						<Input
							className="pr-10"
							value={tempKey}
							onChange={(e) => setTempKey(e.target.value)}
							placeholder="sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
							data-1p-ignore
							type={showKey ? "text" : "password"}
						/>
						<Button
							size="icon"
							variant="ghost"
							className="absolute right-0 top-0 h-full"
							onClick={() => setShowKey(!showKey)}
							type="button"
						>
							{showKey ? <EyeOff className="size-4" /> : <Eye className="size-4" />}
							<span className="sr-only">{showKey ? "Hide" : "Show"} API key</span>
						</Button>
					</div>

					<Popover open={openModel} onOpenChange={setOpenModel}>
						<PopoverTrigger asChild>
							<Button
								size="lg"
								variant="outline"
								className="w-full justify-between"
								aria-expanded={openModel}
								role="combobox"
							>
								<code>{model.label}</code>
								<ChevronsUpDown className="ml-2 size-4 shrink-0 opacity-50" />
							</Button>
						</PopoverTrigger>
						<PopoverContent className="w-full p-0">
							<Command>
								<CommandInput placeholder="Search model..." />
								<CommandEmpty>No model found.</CommandEmpty>

								<CommandList>
									<CommandGroup>
										{models.map((m) => (
											<CommandItem
												key={m.value}
												value={m.value}
												onSelect={() => {
													setModel(m);
													setOpenModel(false);
												}}
											>
												<Check
													className={cn(
														"mr-2 size-4",
														model.value === m.value ? "opacity-100" : "opacity-0",
													)}
												/>
												<code>{m.label}</code>
											</CommandItem>
										))}
									</CommandGroup>
								</CommandList>
							</Command>
						</PopoverContent>
					</Popover>

					<Button size="lg" className="w-full" type="submit">
						Save
					</Button>
				</form>
				<p className="mt-4 text-sm text-muted-foreground">
					Not stored anywhere. Used only for current session requests.
				</p>
			</DialogContent>
		</Dialog>
	);
}